P4 microchip upgrade - What can I purchase?

I have a Dell Dimension 8100 series desktop:

System Information  
System chip set Intel 850
Data bus width 64 bits
Address bus width 32 bits
DMA channels eight  
Interrupt levels 15
System BIOS chip 4 Mb
System clock 100 MHz; 400 MHz data rate

I want to purchase a faster chip but I am usure exactly what to look for that would be compatibable.   I need to be educated about what I should be looking for (i.e bus speed? I assume anything over 400 MHz would be worthless??
Also, how do I know what socket interface to buy?)

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Yes, all that is nice, but what speed CPU is currently installed?
freejasoAuthor Commented:

I assume I can get a 1.8 423 socket type CPU?
The fastest socket 423 is a 2.0 GHz cpu, but I doubt there are many selling anymore, since they have been superceded by socket 478 and LGA775 cpus for a while.  To get more bang for the buck, a new motherboard that can get you up to 3.0 GHz may be a better upgrade path.  Unfortunately, you may need new RAM and a new power supply to match.

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freejasoAuthor Commented:
Yea, I cannot find a 2.0 but I did manage to find a 1.8 Ghz cpu.  So.. when I change out the cpu do I have to purchase a new fan/cooling unit?
Yes!  Chances are that the original fan/heatsink was sized for the old CPU.  The new 1.8GHz CPU will almost certainly dissipate more power so you need an appropriately sized fan/heatsink.  
If this is a retail cpu, it will come with a fan which is sufficient for that cpu.
freejasoAuthor Commented:
Nope - Not a retail chip - I purchased it from computergeeks.com.  Any suggestions on a fan/heatsink?

I like Zalman's products - this CNPS7000B is fairly hefty, but it is quiet and efficient at removing heat: http://www.newegg.com/Product/Product.asp?Item=N82E16835118112.
freejasoAuthor Commented:
Will that fit a 423 socket? Specs don't specify.
Now that I've checked, the 423 is not among the supported cpus: http://www.zalman.co.kr/eng/product/view.asp?idx=141&code=005009

However, the CNPS5100 does support the socket 423: http://www.zalman.co.kr/eng/product/view.asp?idx=24&code=009
freejasoAuthor Commented:
Thanks for the help.
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